New Active Caching Method to Guarantee Desired Communication Reliability in Wireless Sensor Networks
Amir Shiri, Shahram Babaie, Javad Hasan-zadeh · 2012
Wireless sensor networks (WSNs) consist of large number of sensor nodes which are capable to sensing different environmental phenomena and sending the collected information to the base station which is called Sink. Since the sensors are made of cheap components and are deployed in out of hand and uncontrolled environments, they are prone to have faults; so maintaining the network in proper functionality despite undesired events seems to be necessary which is called fault tolerance. Generally every wireless sensor network requires a certain level of communication reliability depending on data recovery mechanism and retransmitting the lost packets. In this paper we will propose a method for recovering lost packets by caching data in some of network nodes which is a combination of Extended NACK and Active Caching (AC) methods and we call it New Active Caching (NAC). Simulation results show that proposed method increases communication reliability level and fault tolerance in wireless